Check the listing for details. Steel 4 x 4mm Hex Set Screw (10) RC Hardware. Condition: New. Listed at 1.20 USD. Integy Steel 4 x 4 mm Hex Set Screws (10) provide secure, low-profile fastening for RC hardware and fasteners. This 10-piece pack is ideal for hobbyists maintaining or building radio controlled models. Specifications: 4 mm diameter by 4 mm long, hex socket drive, steel construction. Brand: Integy. MPN: C27620. Item number C27620. Barcode: 91789028758. Condition: New. Age level: 14 years and up. Applications: Use these grub screws to secure components such as pinions, wheels, hubs, or other RC parts that require a hex set screw. The steel construction delivers strength and dependable holding power in everyday race and scale builds. Package contents: Ten screws per pack. This ready-to-use set ensures you have spare hardware on hand for quick repairs or upgrades.