Stainless steel screw head covers which hold panels directly against the wall and screws onto an internal insert. The inner has a 4mm hole. Available in two sizes and made from 304 stainless steel with a brass inner.
Bike Screw Hole Covers, M5 Rubber Dust-Plugs for Water Bottle Cage,Waterproof Protection for Mountain Road Bike Frames,Black,10-Pack
ULTECHNOVO 4pcs Lightweight Aluminum Alloy Crankset Dust Covers Hollow Integrated Design for Mountain and Road Bikes Protective Crank Arm Caps Enhance Aerodynamics and Cycling Efficiency
Bicycle Cushion - 29 x 22 x 8.5 cm for Bicycle Seat Cushion, Bicycle Seat Cushions, Cycling Saddle Covers, Hollow Design Replacement Wide, Comfortable Accessories for
M18 Aluminium Alloy Hollow Integrated Crankset Crank Screw, Bicycle Crank Screw Set, Lightweight Corrosion Resistant Crank Screw for Mountain and Road Bikes with Dustproof Waterpro (Green)
Titanium Semi-circular Head Screw Hexagon Socket Head Cap Screws M5*15/20~30mm
M3*5/6/8~18mm TC4-Titanium Column Cylindrical Head Screw Socket Allen Head Cap