The o ring is placed into a groove to secure them in place, and then compressed between two surfaces.. X1 Square O-Rings are used to block a path which may otherwise allow a liquid or a gas to escape.
. These sandpaper sheets are ideal for dry sanding and fast removal of paint, varnish or rust.They can be used for dry and wood working. 40 Grit Premium Aluminum Oxide Sandpaper 9 in.