Boring Head Set 38 mm outer diameter, with different shots and chisels. The boring head has a diameter of 40 mm. Included in the box contents include 3 photographs. The for multiple slots are MK/Mk 3/Straight 12 mm Shaft. In addition, range are the set 3 piece chisel set (HSS with 8 mm Shaft), two Drehlinge (5 and 8 mm), one 45 ° extension cable with 5 mm Driver and Allen key for changing the tool. SOCKET bore: 8 mm. Centre Distance between the holes: 11 mm. Transverse hole: 8 mm. Verfahrweg: 11 mm. Minimum bore: 8 mm. Maximum Bore Diameter: 60 mm. Recording thread: 14x1 mm.