PREMIUM QUALITY MATERIAL: toilet seat bolts screws kit, made of high quality rubber and stainless steel mix, strong and durable. EASY TO INSTALL: toilet seat screws replacement kit expandable rubber plugs first slide into the proper holes, when you tighten the bolts, the rubber plugs squeeze into the holes for a snug fit, you don't need to tighten the screws from the bottom without any additional bolts or screws. UNIVERSAL COMPATIBILITY: toilet replacement parts This toilet seat screw set is suitable for most toilet seats compatible, convenient for your toilet seat replacement or repair. KIT PACKAGE: toilet seat bolts replacement kit includes 2 black rubber expansion balls, 2 extra long nuts and 2 stainless steel washers. UNIVERSAL: bidet toilet seat this toilet seat bolt and nut kit is universal with most toilet seats. Compatible with TOTO, American Standard, Gerber, Kohler and other brands. This toilet seat screw set for most toilet seat compatible, convenient for your toilet seat replacement or repair. Compatible with TOTO, American Standard, Gerber, Kohler and other brands.