You are looking at a Mega Loc-it 12" channel bolt lock. This lock fits channels FROM 3 1/2" TO 4" wide, OD. These are of Heavy-Duty Steel Welded Construction. The locks are bolt cutter proof. The only way to remove this lock is by cutting torch and electric cutting tools. The bolts are welded together on one side as the bolt kit is slid thru the coupler and channel, housing is placed over bolts, bolts are tightened. The housing is where the locking of the nuts is done. This is a very secure lock for these channel bolt nuts. This will ensure that the bad guy can't swap out your coupler with his coupler and tow away your trailer. Just another problem, he did not expect. The housing comes with puck lock and is enamel painted. Can be repainted your color. Comes with a 90 warranty from the manufacturer to cover manufacturing defects. There is FREE SHIPPING to the lower 48. Channel, stand, and coupler are for display ONLY, the sale does not include these mentioned. IMPORTANT NOTE: Please let us know what width OD your channel is, and we will ship the correct bolt kit for your channel. The 3 1/2" and 4" bolt kits are different, so let us know which kit you need for the width of you channel on the trailer... Please check out our other Coupler locks we have. NO INTERNATIONAL SHIPPING...PLEASE