The Carrier Roller surface hardness ranges from HRC50 to 56,depth from 8mm to 12mm. Brand  Applicable Model Range CATERPILLAR E70B ~~ E450, D3 ~~ D9N KOMATSU PC20 ~~ PC650, D20 ~~ D355 HITACHI EX30 ~~ EX750 DAEWOO / DOOSAN S50 ~~ S600, DH04 ~~ DH450 HYUNDAI R50 ~~ R500 KOBELCO SK04 ~~ SK450, K903 ~~ K912 MITSUBISHI MS30 ~~ MS280 SAMSUNG / VOLVO SE130 ~~ SE450, MX3 ~~ MX452, EC55 ~~ EC460 SUMITOMO SH55 ~~ SH580, LS2600 ~~ LS4300 KATO HD250 ~~ HD1430 Other Brands LIEBHERR/LR, YUCHAI/YC, LIUGONG/LG, LONGGONG/LK, ZOOMLION-JANYANG/JY, KUBOTA/JH, TAKEUCHI/TB, SUNWARD/SWE, CASE/CX, IHI/IHI, YANMAR/YM, FURUKAWA/GH, BE (1.6T ~~ 40T)