The Trimax TRP 3170 Disc Storage Locks are 2.75" round stainless steel padlocks with 0.39" shackles. Pack of 3 locks that are all keyed alike.• Disc lock protects against bolt cutters• Exclusive armor-plated key core for extra security• Shackle Size: 0.39"• Overall Size: 2.75" round• Made of stainless steel• Sold as a pack of 3 padlocks Armor-plated key core provides added security 0.39"" shackle 2.75"" round lock | Trimax TRP3170 Disc Storage Locks, 3-Pack Keyed Alike