Vortex Indexable U-Drill - 3xD - SPMG/SPKX - 21mmThe Vortex Indexable U Drill is a versatile, insert based drilling solution designed for general purpose metalworking. With a 21 mm diameter and a 3xD maximum depth, it uses standard SPMG SPKX ISO inserts and supports through coolant operation for efficient cutting and chip control. Diameter: 21 mm Depth of Cut: 3xD maximum drill depth Insert Compatibility: Uses SPMG or SPKX ISO inserts Coolant Through Capability: Internal through coolant for improved