Extra Heavy Duty 1000 lb Leg Leveler WITH Jam Nuts (2 Pack) Specially Engineered for Heavy Weight Cabinets, Furniture and Machinery, 500 lb. Capacity per leg. 1000 lb. capacity with 2, 2000 lb. capacity for 4. Recess in top of bolt makes adjustment easy UNDER FULL LOAD with Allen wrench. Cold-rolled steel, 0.079 gauge, with M10 x 3" steel bolt. Mounting Instructions Included. 1 5/16" Pivoting steel base is capped in polyethylene for carpet protection. Jam Nuts Included for Security in High Vibration Environments. Mounting Screws Included.