BT30ER16A-70L,100L, ER Collet Chuck jdmt1003 They have a centre hole

They have a centre hole on both sides

This multi-grade is used on almost all materials

5 kgs of 1 pc

if total length increase flute length remain same of double of diameter

ÿsteel and hard materialsuitable for SRDCN

BT30ER16A-70L,100L, ER Collet Chuck jdmt1003 They have a centre holeBT30ER16A 70L,100L, ER Collet Chuck BT30 Tool Holder accepts all ER16 collets ER16 Collets range from 1 mm to 12 mm Thread inside the internal stop screwMade from alloy steel hardened to 54 56rcBalanced to G6. 3 at 12,000 rpmsConcentricity is less than . 005 micron up to 100 Length and 0. 012 up to 200 Length. All critical tool holder surfaces are precision groundCoolant through capabilityGage length is 70mm,100MM Rear thread for pull stud is M12 X1.