Oetiker Clamps are more effecient than screw clamps. No moving parts to get bound, simply slide onto pipe and pinch/crimp the ear with pincer pliers. Ideal for use in confined spaces. All stainless steel. Simple to remove if needed, but are not re-usable. Standard Worm Gear Clamps are used for clamping insert fittings with poly pipe sprinkler systems. With all stainless steel hex nut, housing and band, they are stronger and more durable than standard automotive or radiator clamps, are re-usable, but considerably more expensive than Oeitiker clamps. Your clamps are not a good place to save money on your sprinkler systems.