Item Included : 1pcs ER32 collet Chuck, 2pcs Spanner, 1pcs screw 1-8-3/4-16, 5pcs ER32 Collet (1/4 3/8 1/2 5/8 3/4). For 3/4 x 16 Spindle Adapter & 5pcs ER32 collet. Perfectly designed to hold a pen mandrel, and other small wood projects where a tenon is used.