Uxcell 10 Pcs 6203Z 17 x 40 x 12mm Double Shielded Deep Groove Radial Ball Bearing Speaker Grill Cover These are the door contact

These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all security burglar alarm system

74inch(L*W*H)

Widely used on holding laboratory freezer tubes or centrifuge tubes

power tools

distribution boxes and other transmission equipment

Uxcell 10 Pcs 6203Z 17 x 40 x 12mm Double Shielded Deep Groove Radial Ball Bearing Speaker Grill Cover These are the door contactDeep Groove Ball Bearings are the most widely used bearing type because they feature simple configuration, easy using, high speed, long life and low noise. Primarily intended for applications where the bearing inner ring rotates. These ball bearing are fitted with two dust shields to prevent ingress of dirt and foreign matter. If the outer ring rotates there is a danger that grease may be lost from the bearing at high speed. Suitable for low speed,