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Pinion 1 Module 30 Teeth 40 Teeth Spur Gear Inner Hole 5 mm 6 mm 6.35 mm 8 mm 10 mm 12 mm 14 mm Gear for Straight Rack High wear resistance, sturdy and durable, long service life. Lower contact ratio between gears, higher load capacity.; Product description Pinion 1 Module 30 Teeth 40 Teeth Spur Gear Inner Hole 5 mm 6 mm 6.35 mm 8 mm 10 mm 12 mm 14 mm Gear for Straight Rack; Product description Pinion 1 Module 30 Teeth 40 Teeth Spur Gear Inner Hole 5 mm 6 mm 6.35 mm 8 mm 10 mm 12 mm 14 mm Gear for Straight Rack; Pinion 1 Module 30 Teeth 40 Teeth Spur Gear Inner Hole 5 mm 6 mm 6.35 mm 8 mm 10 mm 12 mm 14 mm Gear for Straight Rack