HILLMAN FASTENER 372520 Rh SPR Wn Tog Bolt, 3/8X6 Hillman Power Stud Round Head and Spring Wing. Medium-Duty For Hollow Walls. Packaged In Mini Boxes. No. 372514: Type: Round Head Medium Duty, Size: 5/16", Length: 4", Drill Size: 7/8", Package Quantity: 10, Package Type: Box No. 372518: Type: Round Head Medium Duty, Size: 3/8", Length: 4", Drill Size: 1", Package Quantity: 8, Package Type: Box No. 372520: Type: Round Head Medium Duty, Size: 3/8", Length: 6", Drill Size: 1", Package Quantity: 10, Package Type: Box No. 370039: Type: Round Head Medium Duty, Size: 1/8", Length: 2", Drill Size: 7/16", Package Quantity: 50, Package Type: Box No. 370042: Type: Round Head Medium Duty, Size: 1/8", Length: 3", Drill Size: 7/16", Package Quantity: 50, Package Type: Box Thanks For Shopping Hip Hardware Plus's Online Store For All Your DIY and Home Improvement Needs. Leading Provider Of Complete Hardware Solutions Delivering The Industry's Best Customer Service and Support. Features Hillman Power Stud Round Head And Spring Wing USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.