Nylon Plastic Imported PACKAGE SIZE: You will got 4pcs of black snap-in knockout bushing for this package with Mounting Dia: 2 1/2"; Fits hole diameter: 2.45~2.57in(6.23~65.3mm); Inner Dia: 2.2in(55.9mm); Outer Dia: 2.65in(67.4mm); Height: 0.47in(11.9mm) HIGH QUALITY MATERIAL: EASYEAH Cable Cord Grommets is made of UL approved Nylon 6/6 94V-2 which has good insulation, protection effects, good comprehensive performance, flame retardant, wear-resistant, corrosion-resistant, lightweight, durable and sturdy, providing you with a long-term service EASY TO INSTALL: Snap the bushings into its mounting hole with fingertip pressure, the card tooths design lock the board firmly and providing excellent protection for your cables wires and hoses; suitable for most plates below 3.2mm VERSATILE APPLICATION: Our plastic grommets converts raw-edged holes to smooth neat insulated holes and absorbs vibration and cushions; it also can fix cable or prevent abrasion or scratches on tubing hoses shafts and utility lines to improve safety; Used on all types of electrical industrial and automotive equipment and machinery WORLD-CLASS CUSTOMER SERVICE: EASYEAH specializes in made assorted upgrade Rubber or Silicone grommets, plugs, Bushings and Vibration Damping and other hole covers to meet your various needs; Your satisfaction is our top most priority; If you don't like this groments or have any problem please contact us, we'll reply to you in 24 hours; Just be confident to select the right size and "Add to Cart" now