uxcell 20mm x 20mm Plastic Threaded Square Anti-Slip Insert Caps 24 cs Product Mame : Square ThrededInsert;Top Size : 20x 20mm / 0.8" x 0.8" (L*W) Bottom Inner Size : 18 x 18mm / 0.7" x 0.7" (L*W);Over Height : 17mm /0.6" Material : Plastic;Color : Black Net Weight : 61g Package Content : 24 x SquareThrededInserts