This is a Hinge Slotter Kit from Dubro.
FEATURES: Takes the hassle out of slotting control surfaces for gluing hinges. The centering/parallel guide, centers hingle slotter on up to 3/4" (19mm) material. Four handle set plus guide and centering tool for three different size slotting forks: mini, standard and heavy duty hinges. Designed to work with all Dubro hinges. The 3 slotters and the picker are permanently mounted to red nylon handles.
INCLUDES: One Hinge Slotter Kit.