Dovetail Clamp with 1 Brass Screw with Pressure Shoe for Mounting Vixen/celestron. With the quick coupling, you can attach your telescope or camera safely. The clamp can be screwed directly to photo tripods. It is especially suited for building double connections where a high load capacity is needed. Through the areal clamping, a high clamping power can be achieved, while your accessories are protected against unaesthetic pressure marks. Whether you want to clamp a telescope from Vixen, Skywatcher, Orion, Teleskop Service, you simply attach a GP level dovetail bar to the telescope. With most telescopes, this bar is already included. The bar is simply clamped with the pressure screw and fixed. You can also shift the telescope in the clamp for achieving an even better equilibrium. The clamp itself can be adapted to a mount, to the counterweight shaft or another dovetail bar, building a double connection. Extremly flexible through 8 countersunk bores: 7 bores are available for M6 and 1/4" screws. Four M6 bores at 38 mm distance square, one M6 bores lengthwise. One 1/4" tripod thread in the middle with two drilled (but not threaded) to accommodate screws up to 6mm in diameter, center-to-center screw hole spacing is from 27 to 43mm.