Anylarge panel or table top should be secured in a way that allows it toexpand or contract without splitting. These screw-slot bits let youcreate screw slots so that panels can be held in place but are able toslide back and forth without splitting the wood or breaking the screwsecuring them. Both have 12 or 12.7mm shanks and the codes 913.201.11and 813.701.11 are for countersink screws, while the codes 913.101.11and 813.601.11 are for counterbored screws.
The shank available for the North American Market is 1/2".
