DUB-443 Standard Ball Wrench 4-40 PDF Print $3.87 SKU: DUB-443 DUB-443 Standard Ball Wrench 4-40 Add to Wishlist Add to Compare Back to: Du-Bro Products Description This is a 3/32" Ball Wrench (4-40 Socket Head) from Dubro. FEATURES: Fits 4-40 socket head.