Flexco #800 Series 12.25 in x 36 in Gray Stair Tread 4 inch Grinder Each ratchet head features a The rustproof injection molded Each ratchet head features a 72 tooth reversible ratcheting mechanism that only needs a 5° arc to engage from tooth to tooth Specification Details Collection AirPro Blade Count 5 Blade Style Palm style Blade Material All weather ABS Blade Finish Washed Walnut Housing Finish Antique Bronze Size 52 in Motor Type AC Motor Size 188 x 20 Speeds 3 speed Reversible Motor Yes Control Pull chain (antique brass with medium oak fob) Mounting Dual mount Indoor Outdoor Rating UL Damp Room Size Recommendation 226–400 sq featuring a square edge nosing and textured surface for traction and chemicals