... Seal can be used at BOOM, ARM AND BUCKET of excavator.2.Optional color for you of the Oil Seal,Rubber ... , red, yellow, brown, white, green, violet etc, can make it on your order.3.Low friction coefficient,small damage to the ... dry grinding.4.Dustproof oil seal can be used for excavator brands such as CATERPILLAR, KOMATSU, HITACHI, KOBELCOCATERPILLAR, Volvo, KOMATSU, HITACHI ...