Material Number 6945883ISO Catalog ID W4NBM06003RBTGrade WU20PEAdapter Style Machine Side Straight-Cylindrical[D1] Effective Cutting Diameter 6 mm[D] Adapter / Shank / Bore Diameter 6 mm[D3] Neck Diameter 5.64 mm[AP1MAX] 1st Maximum Cutting Depth 13 mm[L] Overall Length 57 mm[L3] Usable Length 21 mm[Z] Number of Flutes 4