QB-BASE120-Q Mounting platform that is inserted in Quick-Build pegs 1.2 x 1.2 (30.48mm x 30.48mm), Allows test fixtures, corner posts, wire end holders,and other harness board accessories to be installed to provide a complete Quick-Buildâ„¢ harness system. Compatible with #8 screw size. Screw length will vary based on test fixtures and accessories used. Note: Consider multiple QB-BASE120-Q components for large test fixtures.