Diablo biscuits are sturdy splines that come in standard sizes and are designed to be used with biscuit joiners on the market. They are made with straight grained hardwoods compressed under extremely high pressure for maximum expansion. Compressed hardwood biscuits for wood joining. Compressed under extremely high pressure for maximum expansion when exposed to water- based or aliphatic resin glues. # 0 19/32" x 1-7/8"