Meccanixity 50Pcs M4 Counterbore Washers, 10Mm/0.39Inch Anodized Aluminum, Green Product Features M4 finishing countersunk washers anodized are decor for Screw RC/FPV/PC/Drone/Mechanical Accessories Model Parts, etc. Outer diameter: 10mm/0.39inch; Hole diameter: 4.1mm/0.16inch; Thickness: 2.5mm/0.1inch; Color: Green; Material: Aluminum Alloy; In the package of: 50pcsx M4 Countersunk Washers The aluminum washers are made of aluminum alloy, lightweight, wear-resistant, and hard. The M4 washer is anodized to prevent rust. The surface is smooth and bright without burrs, the pattern is evenly distributed, and the process is beautiful, uniform force, anti-slip and anti-loose. Insert the screws or bolts through the part to be installed and place aluminum alloy countersunk head washers on them. Use a wrench or torque wrench to moderately tighten the screw or bolt to the desired tightness. Manual measurement, please allow some errors. Please select the correct size and specification of the gasket. Be sure not to over-tighten to avoid damaging the gaskets or connections. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!