Economical floor locks help to stabilize mobile equipment during loading and unloading. They are perfect for keeping carts, trucks, work benches and other portable equipment stationary. All of these floor locks are spring loaded and offer a non-skid rubber foot pad to keep equipment stationary. The heavy-duty steel construction has a bright zinc plated finish. 5" Retracted and 5-7/8" extended height. Use with 4" caster.