uxcell 20mm x 20mm Plastic Square End Caps Tubing Tube Inserts Black 30 Pcs Color: Black; Total Size: 20 x 20 x 14mm/0.8" x 0.8" x 0.6"(L*W*H) Material: Plastic; Net Weight: 61g Package Content: 30 x Square Tube Inserts; Product Name: Square Tube Inserts Battery Included: No; Hole Size: 13 x 13 mm/0.5" x 0.5"(L*W) Fit for Mounting Size: 19 x 19mm/0.75" x 0.75"(L*W)