H.25 is made for continuous production work. Comes with 1/8″ and 1/4″ collets. Use with key tip shaft ONLY 5-1/4″ long, 1-1/32″ diameter, 7.15 oz, 9.6 oz pkg wt. Includes collet sizes: 1/8″ (3.18mm)-installed and 1/4″ (6.4mm), and pin and chuck wrench. H.25 – All Foredom handpieces are made to industrial standards – H.25 has even tighter tolerances. Run-out is 0.003″ measured 3/4″ out from end of chuck or collet. This collet-style handpiece has aircraft-grade, double shielded ball bearings and a heavier housing.