H.25H is a collet type square drive handpiece with larger, permanently lubricated and shielded ball bearings for cool running and continuous use. Has positive locking mechanism (locking ring) for use with Series SRH, TXH, LXH and discontinued H motors. Comes with 1/8" (installed) and 1/4" collets, pin and wrench for changing collets and accessories.  
6-1/8" long, 1-1/32" dia. (center), ship wt. 11.35 oz. 
This handpiece is NOT interchangeable with Foredom "Interchangeable" style handpieces. Other size collets are available separately or in Collet Set HP103000, see below.