uxcell Plastic M6 Flush Type Wiring Hole Tube Insert Caps 6mm Dia 30 Pcs Black Product Name : Tube Insert;Material : Plastic Fit hole Dia : 6mm / 0.24" M6;Head Dia : 9mm / 0.35" Height : 7mm / 0.28";Color : Black Weight : 7g Package Content : 30 x Tube Inserts