Material Number 6945882ISO Catalog ID W4NBM05003RBTGrade WU20PEAdapter Style Machine Side Straight-Cylindrical[D1] Effective Cutting Diameter 5 mm[D] Adapter / Shank / Bore Diameter 6 mm[D3] Neck Diameter 4.7 mm[AP1MAX] 1st Maximum Cutting Depth 13 mm[L] Overall Length 57 mm[L3] Usable Length 18 mm[Z] Number of Flutes 4