We developed these tools for cutting accurate neck joints for a traditional Martin dovetail The templates are made of extra-thick acrylic for sturdiness, and they're clear for easy alignment Templates are 3/8" (9.53mm) thick clear acrylic, and 7-3/4" x 10" (196.85mm x 254.00mm) Template set includes: 1 template for routing the neck heel, 1 template for a matching neck block joint, instructions and plans for a simple wooden jig to hold the neck or body in position while routing