Made of high-quality stainless steel, this screw pitch counter offers high strength and hardness, making it durable and resistant to breakage for long service life. The thread gauge features high hardness and wear resistance. The surface is etched with clear, accurate scales for easy identification and reading. Includes 24 metric sizes: 0.25 / 0.3 / 0.35 / 0.4 / 0.45 / 0.5 / 0.6 / 0.7 / 0.75 / 0.8 / 0.9 / 1.0 / 1.25 / 1.5 / 1.75 / 2.0 / 2.5 / 3.0 / 3.5 / 4.0 / 4.5 / 5.0 / 5.5 / 6.0. Includes 28 inch sizes: 4G / 4.5G / 5G / 6G / 7G / 8G / 9G / 10G / 11G / 12G / 13G / 14G / 16G / 18G / 19G / 20G / 22G / 24G / 25G / 26G / 28G / 30G / 32G / 36G / 40G / 48G / 60G / 62G. The set includes 52 pieces with metric, 55-degree, and 60-degree blades, along with two 60-degree center gauges and one 55-degree center gauge for thread measurement. Compact and portable design allows for easy carrying and convenient use. Ideal for both internal and external diameter measurements. Helps simplify work tasks. Metric and inch thread pitch gauge set for versatile screw measurements. Product specifications: Material: Stainless Steel. Thread sizes included: Metric: 0.25 / 0.3 / 0.35 / 0.4 / 0.45 / 0.5 / 0.6 / 0.7 / 0.75 / 0.8 / 0.9 / 1.0 / 1.25 / 1.5 / 1.75 / 2.0 / 2.5 / 3.0 / 3.5 / 4.0 / 4.5 / 5.0 / 5.5 / 6.0. Inch: 4G / 4.5G / 5G / 6G / 7G / 8G / 9G / 10G / 11G / 12G / 13G / 14G / 16G / 18G / 19G / 20G / 22G / 24G / 25G / 26G / 28G / 30G / 32G / 36G / 40G / 48G / 60G / 62G. Package includes: 1 x 52-piece metric and inch thread gauge set (55° and 60°), 2 x 60° center gauges, 1 x 55° center gauge. Note: Measurements are taken manually; please allow 1-3 cm error. Due to lighting and display differences, slight color variations may occur. Actual product received may vary slightly.