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This is the sacrificial differential skidplate that Currie installs to the bottom side of each and every Rock Jock and Iron Jock 60 axle they build. These skidplates are made from abrasion-resistant AR400 steel material-the same material used on bulldozer blades and backhoe buckets. The idea is that this bolt-on skid will take the abuse so that the cast-iron center section does not have to. We like that they can easily be replaced as needed by simply removing four Allen bolts.