1/4 Inch Shank Router Bit Collet Extension Chuck Converter Adapter with ER20 Spring Collet and ER20 M Type Collet Chuck Wrench Spanner, Convert 1/2-Inch & 1/4-Inch Shank Bits (Size:ER20-1/4)

Shank Diameter: 1/2"(12.7mm), Accept Shank Size: 1/4" & 1/2" Shank, Extend Length: 2-1/4" ; This router collet extension chuck accepts both 1/4" and 1/2" shank router bits for converting and extending. Carbon Steel: This collet extension rod is made of carbon steel material, with high hardness and durability. Application:The router collet extension chuck accepts both 1/4" and 1/2" shank router bits for converting and extending. Widely used, boring, milling, drilling, silk attack, sculpture, CNC, and other processing, for professionals and hobbyists demanding. Easy to Use: Place the router collet extension shank in the 1/2-inch router collet and the router bit shank in the extension collet and tighten both; M Type ER20M wrench included. Need M Type ER20M wrench to tighten the collet. Package Includes: one 1/2 Inch shank collet extension, one ER20 6.5mm Collet, one ER20 12.7mm Collet, one M Type ER20M wrench.