This is a 4 Piece kit including.....
Left & Right OEM type Extended Rocker (Goes into jambs)
Left & Right Crew Cab Corners
1999-1906 Chevy & GMC Crew Cab Truck
Fits 1500, 2500, 3500 series along with the HD series
Rockers Measures about 89" x 12"
Fits below front & rear doors on drivers & passengers side
As well as the bottom of the cab corners
Left = Drivers side
Right = Passengers side
1.2MM thick! Best on the market!!