38 PIECE 5/16 PREMIUM C6 CARBIDE TIPPED LATHE TOOL BIT SET BRAZED SINGLE POINT Our Part # ALL-19892 5/16" Premium C-6 carbide tips designed for long tool life in steel, alloys, etc. 8 Pcs Style AR & AL- For general machining applications, turning, facing, boring and chamfering 6 Pcs Style E- 30 Lead angle for threading, chamfering, V-grooving, turning, facing & boring 4 Pcs Style BR & BL- For general machine applications where a 15 lead angle is desired