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Interlocking 4-Way-Lock-Stencils Each individual stencil has four sides allowing you to lock each stencil together to create your custom word or phrases. The locking system allows for pre-spacing of each letter or number. All 4-Way-Locking Stencil sets are only sold on our industrial grade material. We offer sizes between 3"-36" on a 60-mil, 1/16" Thick plastic material. Choose from our Alphabet & Numerical Sets. Additional Spacer Sets and custom fonts are available.