Aluminium Alloy Material: Made of anodizing aluminium; precision machined solid aluminum finder shoe base in matte black; for almost all viewfinder holders; for Witty 1 Tangent attachment etc; fits all lens barrel radii
Easy To Install: Two large knurled thumbscrews makes it easy to install; bases feature two large thumbscrew locks to secure finder scope or reflex sight in place; even while wearing gloves; just put it on optical tube and tighten the screws
Multi-Function: There are two elongated holes on this base and a single countersunk hole for screws up to M5 in the middle; two screws are on the side of base; the distance between the center points of the screw holes is 24 to 41 mm
The mounting bar has two M6 through-holes on both sides for easy adaption to rings
Three threaded through-holes: the center hole has 0.25 inch - 20 threads and the two larger holes on either side of center have M8 x 1.25 threads; accepts all sights designed to fit a standard Picatinny rail