Makita® O-Ring 5 is designed for 9554NB, BGA452, 9557PB, 9557NB, 9553NB, GA4030K 4", GA4530 4 1/2" and LXT lithium-ion cordless 4 1/2" cut-off/angle grinders. O-ring can withstand thousands of pounds of pressure and enables to create a seal between two or more parts.