Vevor Concrete Slider Knee Board 2 Pair Sliding Boards 28' X 8' Stainless W/ Pad Stainless Steel Construction 28'x8' Slider Knee Boards EVA Protective Knee Pads Built-In Toe Brackets Lightweight Easy To Move For Concrete Finishing Concrete Board Size: 28'x8'x4' (70x20x10 cm),Product Type: Concrete Slider Knee Board,Number of Pieces: 4,Knee Pad Size: 7.1'x5.9'x3.5' (18x15x9 cm),Material: Stainless Steel & EVA,Application: Concrete Finishing and Screeding,Board Thickness: 0.08' (2 mm),Pad Thickness: 1.2' (3 cm),Item Weight: 40 lbs (18.18 kg)