The Adjustable Spreading Board is an excellent insect mounting tool used for positioning the wings of insects as they dry, with the body of the insect in the groove. The groove width is adjustable to accommodate different sizes of insects. The basswood pinning surfaces are 2″ wide (each side), angled at 165 degrees (slightly elevated), so that when the dried insect is removed it will “settle” into a horizontal position for your collection. Pinning surfaces are attached to ½” composition board which also functions as pinning groove bottom. Sliding brackets with thumb screws allow for a groove width up to 7/8″. Comes fully assembled. Total length of board is 12″.