The Spare Dovetail Base for Reflectors allows you to use any Lumicon finder bracket (80mm; 50mm; Laser-pointer) on another reflecting or cassegrain telescope. With a radius-cut of 9.25", the base mounts snuggly to many reflectors. Pre-existing holes with center-to-center spacing of 1.0" to 2.1" may be used to mount the base using two (2) screws; or four (4) screws with 1.75" center-to-center spacing may be used. Mounting hardware (8-32 screws/nuts) included. Item not compatible with brackets from other manufacturers.