8-year update:
Still going strong. Occasionally used, but very useful. It's helpful to lubricate the pivot points of everything on the lopper, so that the jaw springs back open. Occasionally it gets stuck in a bit - a good sharp upward push will free it. I've had to replace the rope once, no big deal. It's just super handy when you need to lop something high up.

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The lopper seems to be well made. I've been using consumer-level loppers and saws and finally upgraded to the Hayauchi, which is fantastic. With a 21 foot reach, it was begging for this lopper head. Together, they do make a pretty heavy combo - I quickly learned to keep the pole as upright as possible. It cuts with a minimal effort, however, it does take a fair amount of rope pull to accomplish it (when cutting thin branches). It's a good trade-off, my old lopper required a lot of effort having only a single pulley.

It's clear this is an aftermarket product for the Silky pole. The attachment is a clumsy two bolts with lockwashers and nuts and doesn't use Silky's excellent mounting (as used for the saw blade). The hardware appears to be of high quality but I worry about deforming the pole top by tightening them too tightly. I plan to replace the nuts with nylock nuts so they won't loosen and I won't have to tighten them to engage the lockwashers.

All in all a very good addition to the Silky Hayauchi.

I asked the question of 1.5" or 2.0" for the cutter and upon receiving my lopper,I measured it and it is 2" at the opening.However I was told you wont be cutting much thick hardwood with this and they are right.I haved used it on silver maples,white pines and pin oaks.

You have to make sure the long silver bar doesnt get up against another branch or twig because it keeps you from ratcheting and making the cut and I nearly ( unintentionally ) left it up in the tree as I was halfway through the cut and got it wedged.

It does cut real nice though and the ratcheting system works good.I would also like to mention that when I had the pole extended
completely and trying to cut it is very top heavy.Im 6'1" and 250 and after using this for awhile it does make you tired from the weight at the top even though it weighes maybe 4-lbs.Try to keep the pole vertical and its alot easier.

One more thing.......with the pole extended completely and pulling on the rope tends to make pole bend since your losing the rigidity of having the pole sections inside each other.

Does not cut near as good as expected. Thought with the weight and leverage it would cut a 1" branch with ease, but it doesn't. I will be using it only for those branches that are too high to reach with my Fiskars lopper! You also need to be at 90 D and not have other branches in the way. The Fiskars has a rotating head so you can cut at any angle; for instance, high drooping branches. I bought the Silky to cut high thick branches. It will cut high branches but not anything over about an 1-1/4". Well made, but I don't get why the extreme leverage, just doesn't seem to help with the cutting ease.

Excellent, like my Silky Hayauchi 21-ft. pole saw. Discovering that there was a Silky lopper attachment was a very pleasant surprise. I have had the pole saw for 9 years, and it has been indispensable for maintaining the many trees we have. I recently needed a lopper to deal with a leyland cypress that had grown to 35-40 feet in height and to the point that, when the branches were laden with rain or snow, they would droop enough to block the signal to our satellite dish.

It took less than 5 minutes to remove the 2 screws and saw blade on the pole saw and attach the lopper and secure it with the same 2 screws. Within 30 minutes, I had trimmed back the offending branches, all while standing on the ground and using only one/arm hand to pull the rope. The lopper components were truly heavy-duty, the materials were high quality, and the action was smooth and, well, silky - exactly what I'd come to expect from my Silky saw (which has been well worth the $200 I paid for it 9 years ago, less than the cost of 1 visit by an arborist).

Silky Sintung 50 Lopper Head for Hayauchi Pole Saw arrived promptly and undamaged. I have used it on my Silky Professional 179-39 - 21' telescoping pole. The advertisement says that attaching hardware is NOT included, BUT the attaching hardware was INCLUDED with my purchase. The Lopper head attaches easily to the top of the pole ( 2 bolts with locking nuts & lock washers). The lopper head is very sharp, and the dual pullies radically reduces the strength required to cut a limb. This is the best lopper in my arsenal. This Lopper coupled with the Silky New Professional Series 179-39 Telescopic Landscaping Pole Saw HAYAUCHI 390, 21-Feet . I am sure that it will attach to the 16' model. Note that the lopper fit is for oval shaped poles ; it is not round/circular.