NAMOKA Screw Size Chart & Drill Bit Gauge – 8.07 x 3.23 x 0.16 inches, Blue 15cm

NAMOKA Screw Size Chart & Drill Bit Gauge – Laser Etched 6061 Aluminum Pilot Hole Guide (#4-#14) with 15cm & 6″ Ruler. 4mm thick aluminum plate with fade-proof laser-etched markings. Tapered bits for countersinking (left column) and straight bits for shank clearance (right column).