The Malco SD50 The Sider Double 5" Marking & Cutting Template allows you to save profitable time on each job. The Sider works quickly and accurately replacing chalk lines, squares and straight edges. This tool can also be used to scribe or square to mark or score precise lines into the vinyl siding.  Use a utility knife in the precisely marked  1/8" holes to quickly and accurately cut. This Sider is constructed from durable 18 gauge stainless steel and is available in 5 different sizes