Great White Lab Series Features: •10X increased durability and longevity with extremely hard cutting surface of 2,800 Vickers •Abrasion resistance reduces surface heat and vibration for a cooler, more consistent surface finish. •Comprehensive selection of shapes, sizes and grits, manufactured with tungsten carbide heads and stainless steel shanks. Material and Usage: Precious Metal Castings - Trim, Contour and Finish Chrome Cobalt - Adjust and Finish Non-Precious Metal Casting - Trim, Contour and Finish Partial Denture Framework - Trim and Contour Specs: Shank: HP Head Length: 14 Head Diameter: 060 Multi-Use: Yes ISO Shape: 275 Series: UM ISO Grit: 145 HP Number: 500 104 275 145 060 Color Band: Red/Green Max Speed: 20,000 Pack Size: 1 Each