HHIP 3/4 X 3/8 X 1/4" Pivot Head Knurling Tool Knurl size is 3/4 X 3/8 X 1/4". Self-Adjusting Pivot Head Design: Automatically aligns knurl wheels to the workpiece for even pressure and consistent diamond knurl patterns. Medium Diamond Knurl Pattern: Produces a clean, uniform diamond finish ideal for improving grip on shafts, knobs, and handles. HSS Knurl Wheels: Durable high-speed steel knurls deliver long tool life and reliable cutting performance on steel and other metals. Reduced Chatter & Tool Stress: Pivoting head helps distribute cutting forces evenly, minimizing chatter and improving surface finish. Compatible with Manual & Engine Lathes: Designed for professional machinists and metalworking applications.