1Stainless Steel Roller: Uses stainless steel roller, small resistance, unhindered rotation. The mute design makes the measurement more accurate. 2PE Bracket Design: Integrated processing and cutting, not easy to wear. Suitable for use of arrows with different diameters, convenient and quick. 3Aluminum Alloy Main Body: Aluminum alloy with width of 30mm / 1.2in is selected as the main body, which is convenient to use and carry. 4Easy to Operate: Put the arrows on the test instrument and rotate the arrows shaft by hand. The arrows with good straightness will stay stable and easy to operate. 5Easy to Use: Arrow straightness detector, perfect for archery shooters. Easy to use and fine workman. Without any difficult requirements even though you use it for the first time. Item Type:ArrowStraightnessDetectorWeight: Approx.272g / 9.6ozMaterial: Aluminum Alloy,Stainless SteelProduct Length: Approx.30cm / 11.8inWidth: Approx.30mm/1.2in Package List 1 x Arrows Straightness Detector2 x Stents