They are hardened 45-50 HRC not to wear out
CRM EXTERNAL HAS A YELLOW BOX
TN60 Grade is a universal grade suitable for many materials
APGT113504/08 INSERT for Aluminium Brass and Soft material
BT50 side lock adaptor , SLA ,16,20,25,32,40,50 mm For Cylindrical Shank pack of 1 SPMG11 They are hardened 45-50 HRCBT50 SLA holder, also called SIDE LOCK HOLDER BT50 SIDE LOCK is primarily used to hold cylindrical or straight shank items, such as indexable cutters, baby chucks, and carbide drills, providing a straight shank interface for improved rigidity and strength. Its range is 16 mm to 40 mm, as a small shank diameter can be held in a standard collet chuck. Made from alloy steel hardened to 54 56rcBalanced to G6. 3 at 12,000 rpmsConcentricity is less than .