1 Morse Taper Crown Drive Centre. Our Crown centres feature a set of sharp teeth that bite into the wood to give a more secure hold than traditional centres. With more points of contact there is also far less chance of your timber splitting. They also feature a spring loaded centre point Diameter of Crown Teeth 12mm (1/2″) Diameter of Body 16mm (5/8″) Total Length 86mm 1 Morse Taper