Adjustable pin-in-hole, sliding tube mechanism. Only pre-measured fixed adjustments available, Pin is not sturdy.

The first difference that I immediately noticed with the BuddyBar door jammer is its heft and weight. To set the length, I simply approximated the distance between the door knob and about a foot away from the door at the bottom. Then I set it (latched it) without being under the doorknob. From that point on when I wish to use it – I lightly slip it underneath the doorknob (snug, but not too tight) and let it find its natural (pre-adjusted)distance to the floor. This product is so simple that you might be forgiven for being surprised at how effective it can be. It consists of a powder-coated steel bar weighing about 8 pounds, which is all steel and has no easily breakable plastic parts. This allows the Buddybar to withstand huge amounts of pressure from the outside.As we said earlier, you wouldn’t get the best results if the floor is wet or oily or otherwise dirty. The ‘wedge’ that fits underneath the doorknob has about 1/2 inch of spring to it – which allows some ‘give’ while you wedge it under the knob. Makes it easier to set it. You could use it on your house door or you could carry it with you to the hotel you would be staying in.

Rubber padding glued on the bottom of the foot; the pivoting ball at end of tube that inserts into foot has been known to pop out. Adjustable pin-in-hole, sliding tube mechanism. Only pre-measured fixed adjustments available, pin is not sturdy. I think the door hinges would break before the Buddy Bar gave way. That said, short of an intruder having a police-type battering ram, they will give you time to either arm yourself (if you are smart enough to keep a firearm in reach), get to a “safe room” and/or dial 911.My daughter just bought a house. Three doors. I bought her three Buddy bars. A little pricey compared to the imitators, but what is your safety worth? This product has great force withstanding capacity. But at the end of the day, it is a mechanical product which would sound an alarm anywhere if it is compromised if you are away. Bottom Line. They are well made, heavy gauge steel and work on the principle of a wedge. The harder you push, the more resistant the wedge becomes. The specific model we are discussing here works well for doors that open into the room or outward. But if there is a set of French windows or what we refer to as a patio window, which slides horizontally to the right or left, instead of in or out, then this particular model might not work. All this and more are explicitly mentioned and explained in the instruction booklet. Buddy-bar Testing Report