This Centaur Precision Tools ER40/R8 Collet Chuck is designed to hold ER16 Collets and has an R8 Shank. Allows the user to change tools without removing the chuck from the spindle.
R8 Collet
R8 Collet Sets
ER40 Collet Chuck (R8 Shank)
ER32 Collet Chuck (R8 Shank)