Rockler 4” Keyed Bridge Hose Clamps Stainless Steel: These stainless hose clamps are durable and reliable clamping solutions that keep your hose connections secure for more years. Our heavy duty hose clamps have superior connection strength. The plastic key hose clamp lock requires only finger tightening for a powerful clamping force. This dust hose clamp has a longer key shaft that gives knuckles clearance when tightening. Our bridge clamp is easy to install or replace clamps without requiring special tools or equipment. The 4” keyed bridge hose clamp works great and is superior to straight hose clamps for getting a good seal --- About Us: The history of Rockler Woodworking and Hardware goes back to 1954 when Norton Rockler started the Minnesota Woodworkers Supply Company in north Minneapolis. It was a small mail-order business with a big aspiration – to become woodworkers' go-to resource for everything they need to complete their projects.