The Losmandy VCB11 curved block set is necessary if you wish to mount the Losmandy #VSCT17 dovetail bar to Celestron 11” scopes and OTA's.
One of the blocks mounts on the rear cell and is fixed with two socket head machine screws (supplied) in the holes spaced 1.75" apart. The hole in the middle should be threaded on this block.
The second block is mounted through the dovetail bar into the front cell , again using the socket head machine screwed (supplied). The centre hole in this block is larger and not threaded.
Made of machined aluminium and anodised black for long life. Comes complete with stainless hardware .