1 Morse Taper Revolving Crown Tail 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 24mm (1″) Diameter of Body 32mm (1.1/4″) Total Length 120mm 1 Morse Taper