The push block safely holds rails for scribing door panel routing. The base is 5/16" thick to ensure flatness. Has a sliding front stop with grip abrasive. It has an adjustable toggle clamp for variable heights. The Spelch block prevents breakout. Maximum width is 4" with a minimum thickness of 19/32" and a maximum thickness of 1-3/16". Handles can be changed to allow overhead router for end cuts. Imported.