Material Number 6945631ISO Catalog ID W4N1M04003RATGrade WU20PEAdapter Style Machine Side Straight-Cylindrical[D1] Effective Cutting Diameter 4 mm[D] Adapter / Shank / Bore Diameter 6 mm[D3] Neck Diameter 3.76 mm[AP1MAX] 1st Maximum Cutting Depth 11 mm[L] Overall Length 57 mm[L3] Usable Length 16 mm[Re] Corner Radius 0.2 mm[Z] Number of Flutes 4