Material Number 6945886ISO Catalog ID W4NBM08004RBTGrade WU20PEAdapter Style Machine Side Straight-Cylindrical[D1] Effective Cutting Diameter 8 mm[D] Adapter / Shank / Bore Diameter 8 mm[D3] Neck Diameter 7.52 mm[AP1MAX] 1st Maximum Cutting Depth 19 mm[L] Overall Length 63 mm[L3] Usable Length 27 mm[Z] Number of Flutes 4