Gas Carbon fiber Spinner 3-Blade Wide SlotTOP QUALITY: Premium carbon fiber fabric and CNC processed aluminum backplate ensure consistent quality and best RC aircraft performance. Spinner for GAS RC Airplanes Specs: Diameter Height Weight Center Hole Side Holes 4. 5 In 128 mm 3. 25 oz 10 mm 2 mm 5 In 142 mm 4. 22 oz 10 mm 2 mm 5. 5 In 160 mm 5. 5 oz 10 mm 2 mm 6 In 170 mm 6. 05 oz 10 mm 2 mm Before each flight, the bolt tightness needs to be checked, sheer strength created by loose bolts