H.28H is our newest collet type square drive handpiece that accepts accessories with up to 1/8" diameter shanks. Unlike Foredom's other square drive handpieces, this slender model attaches foruse with Series SRH, TXH, LXH and discontinued H motors without a large plastic sliding positive locking mechanism that comes on the other 3 models of square drive handpieces. Has pre-lubricated ball bearings that do not require maintenance. Comes with 3/32" (installed) and 1/8" collets, pin and wrench for changing collets and accessories. 
5-5/8" long, 23/32" dia. (center), 1/2" dia. (taper), ship wt. 0.5 oz. 
This handpiece is NOT interchangeable with Foredom "Interchangeable" style handpieces. Other size collets are available separately or in Collet Set HP600, see below.