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.
Gatuida 4pcs Aluminum Alloy Bike Crank Dust Covers Hollow Integrated Crankset Protector for Mountain and Road Bicycles Snug Aerodynamic Fit Reduces Wind Resistance Lightweight Center Shaft
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
M5*30/35~50mm TC4-Titanium Column Cylindrical Head Screw Socket Allen Head Cap
Titanium Semi-circular Head Screw Hexagon Socket Head Cap Screws M5*15/20~30mm
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)