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 hinge 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.