Wlauqueta Milling Bit Collets Extension Chuck Converter Adapter, 1/2.1/4 Bit with ER20 Collet Convert

diameter: 1/4 (6.35 mm), accept shaft size: 1/4 and 1/2 , length extended: 2-1/4. This cutter collet extension chuck takes both 1/4 and 1/2 end mill bits for converting and expanding. the dangerous temptation to pull the of the collet and extend the chisel to reach the full depth of cut. Insert the extension shaft of the cutter collet into the 1/4 cutter collet and the cutter shaft into the extension collet and pull both. Converter adapter and ER20 spring collet for maximum strength and long service life; ER20 M type collet wrench high carbon steel, anti- handle design, for ER20 M lathe clamping nut. High precision, performance. Extend your cutter to achieve full cutting depth, for both 1/4 and 1/2 end mills. This router chuck provides the extra cutting depth needed for many milling tasks. Easy to use, control, improve your work efficiency.