New Pig 55-Gallon Open-Head Poly Drum Lid, 24-1/2&rdquo; Diam x 11&rdquo; H, Black, DRM965-BK Large 18-inches diameter opening allows fast and easy waste collection Thick-wall, 100 percent polyethylene construction resists UV rays, rust, corrosion and most chemicals Attaches securely to drum with thumb screws to replace open-head drum lid Hinged lid stays upright when open; closes easily to help reduce vapor emissions Multiple lid color options allow you to segregate drums