Specifications Rotation speed : 2,000 - 20,000rpmMax. torque : 660g·cm (used with controller UC500C)Weight : 200g (Curl cord is not included)Size : diameter 27.5 × L144.5mm Mounted collet : diameter 2.34mm (KP-036B) Accessories Collet diameter 3.0mm (KP-032B)Collet changing wrench (KP-504)Handpiece rest stand (KP90-101)Carbon brush 2 pcs (PKE60-101)