Cnc extender adapter made especially for 1/8" Shank router bits., #47648, (D) diameter 7/16, (D) diameter 7/16, overall length (L) 2-1/4, Max RPM 18, 000, L1 19/32, L2 13/16, L3 1/4, D1 1/8, 47648 1/4 inch shank CNC extension adapter for 1/8 inch shank router bits