MISTER HITCHES TOW BALL BLACK OXIDE 50MM 3500KG BALL DIAMETER: 50MM Â LOAD CAPACITY: 3500KG Â SHANK DIAMETER: 7/8" (22.2MM) Â SHANK LENGTH: 60MMÂ Â FLAT SIDED BASE FOR EASE OF TIGHTENING & REMOVAL INCLUDES SPRING WASHER & NUT BLACK OXIDE FINISH FOR CORROSION PROTECTION COMPLIES WITH AUSTRALIAN STANDARDS AS/NZS 4177.2 - SKU:MHTB50BBS