This tool is designed to mould the BB30 and SRAM DUB threadless centre compound from the frame. The tool safely presses the centerfold bowls out of the frame without the need for a hammer. The kit includes two interchangeable adapters - a 30mm adapter for BB30 centers and a 29mm adapter for Sram DUB PF centers. If using the 30 mm adapter option, this jig can also be used for other brands of centres that are 30 mm in diameter. The rubber O-ring serves as a frame scratch prevention.