FITMENT: Running boards compatible with 2007-2018 chevy silverado/ gmc sierra 1500 2500hd 3500hd double cab, 2019 silverado /sierra 2500hd 3500hd double cab, 2019 silverado 1500 ld double cab and 2019 sierra 1500 limited double cab with 2 narrow rear doors. Does not compatible with diesel engine model. Not compatible with crew cab (4 full-size doors). MATERIAL: Made with heavy textured powder finish coated steel and heavy duty material. Step pads have special non-slip tread for superior traction. WIDE DROP STEP: Drop down style, 4.7 inch drop off making it easier to enter and exit. Durable non-slip steps provide more protection. STRENGTH: Maximum load more than 450 pounds. 3" tube the lesser gap between the bar and frame. SIMPLE INSTALL: No drilling or modification is required. Include two steps(one left and one right ), mounting brackets, hardware, and instructions. FITMENT: Running Boards Compatible With 2007-2018 Chevy Silverado /Sierra 1500 2500HD 3500HD & 2019 2500HD 3500HD & 2019 1500LD Double Cab with 3/4 Size Rear Doors.Does Not Compatible With Diesel engine & 19-24 Silverado /Sierra 1500 & 20-24 2500HD 3500HD. Not Compatible With Compatible With Crew Cab (4 Full-Size Doors). MATERIAL: Made With Heavy Textured Powder Finish Coated Steel And Heavy Duty Material. Step Pads Have Special Non-slip Tread For Superior Traction. WIDE DROP STEP:Drop Down Style, 3.5 Inches Drop Off Making It Easier To Enter And Exit. Durable Non-slip Steps Provide More Protection. STRENGTH: Maximum Load More Than 450 Pounds. 3" Tube The Lesser Gap Between The Bar And Frame. SIMPLE INSTALL: No Drilling Or Modification Is Required. Include Two Steps ( One Left And One Right ), Mounting Brackets, Hardware, and Instructions.