This set contains the 37-240 aluminum "thin slot" miter box and 35-520 fine kerf razor saw with 24 tpi (see 35-520 for complete description of this saw). The gold color aluminum miter box has unique narrow slots (.014") to maintain very accurate cuts with all of Zona's fine kerf saws (35-500, 35-520, 35-550, and 35-560). The miter box is 6-1/2" long, with a 7/8" cutting depth and 2" cutting width. Has slots for making 30, 45 and 90 degree cuts.