Dual measurement systems: metric/mm and imperial/in. This enables use on projects requiring either unit. End groove for quick setup: adjust the stop and place a pencil in the groove to mark immediately. Clear, durable scale: base color red or black with a white scale. White text on red or black provides high contrast for easy reading. Graduated lines and base colors are printed by a special process to resist fading, keeping the scale legible over time. Sliding ruler with stop: the stop is held in place by two thumbscrews that lock it to the ruler. Slide it off the ruler and through the groove in the blade to stop and secure it in any position, preventing slipping for repeated measurements on multiple boards. Material and durability: multifunctional scriber pins are made of aluminium alloy, precisely milled for high-precision measurement. Corrosion-resistant, rust-proof, high hardness, and designed for long service life. Use scenarios: - Cabinetry and furniture making: set a stop to mark the same length on multiple boards for consistent cuts. - Scribing and layout tasks: use the pencil-in-groove method to draw precise lines across workpieces. - General workshop projects: switch between metric and imperial units for mixed-unit tasks while maintaining accuracy.