5 90 Degree Carpenter's Layout Ruler45 90 Degree Carpenter's Layout Ruler Woodworking T - shaped marking square is used for various marking holes,like wood processing, aluminum processing, marble processing, stainless steel processing and so on.3-10 mm drill bit fixed hole, 0-60 degree marking, durable, up to 3 cm thicknessWoodworking T - shaped marking square is used for various marking holes,like wood processing, aluminum processing, marble processing, stainless steel processing and so on.3-10 mm drill bit fixed hole, 0-60 degree marking, durable, up to 3 cm thickness