What’s Included: 1X self-centering chuck body 6X lower jaw 1X safety chuck 3X fixing screw Specifications: Model: K13-125 Jaw material: Hardened steel Maximum speed: 3000 r/min Lower jaw: 6 lower jaw Power supply: manual Inner claw: Clamping range A-A1: 2.5-40mm Interference range B-B1: 38-125mm.