Maximize metal removal rates and securely clamp solid carbide end mills under aggressive roughing conditions with Heavy-Duty Chucks SK Taper Tool Holders. Built for high-torque CNC milling machines and heavy machining centers with DIN 69871 (SK) steep taper spindles, these power milling chucks utilize a thick-walled needle roller bearing assembly. This design exerts extreme radial clamping force evenly around the tool shank, virtually eliminating micro-slippage, chatter, and tool pull-out during heavy titanium, stainless steel, and alloy machining.