This Adjustable Spreading Board is an excellent insect mounting board. Basswood pinning surfaces are 2″ wide (each side), angled at 165 degrees. Pinning surfaces are attached to ½” composition board which also functions as pinning groove bottom. The groove is adjustable, allowing for larger-bodied insects. Sliding brackets with thumb screws allow for a groove width up to 7/8″. Pre-assembled. Total length of board 12″.