If you are serious about building your own sail rigs we recommend that you add these handy X-blocks to you rig building tool sets. These blocks are perfect for positioning and drilling mast and boom holes in round mast and boom stock. The blocks work great for drilling CFmast and booms as well - even if the masts are tapered. The X-block are polished Stainless steel and work great on desktop as well as on a mill machine. the blocks support round stock from 6mm to 13mm.
Lifetime warranty