uxcell 4pcs Rubber End Caps 40mm ID Vinyl Round End Cap Cover Screw Thread Protectors Black - Amazon.com
Rubber-metal buffer MGS diameter 40mm height 30mm thread M10 x 28mm stainless steel 1.4301 SKU: 68980530 - Maedler North America
Amazon.com : 5PCS-40mm Door Stops, Self-Adhesive Door Stopper with Black Rubber & Stainless Steel Body, Sound Dampening Rubber Buffer Heavy Duty Top for Home & Office Use : Office Products
Neoprene Stoppers, 1 Hole - Blue - Size: 40mm Bottom, 49mm Top, 40mm L — Eisco Labs