Unifix 5.5/6.3X130 Hex Head Hi Thread Comp. Panel Self Drill Screw Heavy Section (Box of 100)The 5. 5 6. 3X130 Hex Head Hi Thread Comp. Panel Self Drill Screw is designed for heavy section applications, providing reliable performance and ease of use. High Quality Construction: Made for durability and strength. Self Drilling Design: Eliminates the need for pre drilling, saving time. Hex Head: Provides a secure grip for easy installation. Hi Thread: Ensures a strong hold in heavy materials. Versatile Use: Ideal for various heavy section