An apparatus for use with a masonry block. The apparatus includes a body part that is at least substantially planar, has a perimeter, has a front surface and an opposed rear surface. The apparatus also includes a ¼ block stop part extending from the front surface and a ½ block stop part extending from the rear surface, the body part being dimensioned and the stop parts being positioned and dimensioned such that, when the body part is operatively positioned in a first configuration with the ¼ block stop part abutting the block, the perimeter of the body part can be used to mark the block for a ¼ block cut and when the body part is operatively positioned in a second configuration with the ½ block stop part abutting the block, the perimeter of the body part can be used to mark the block for a ½ block cut.