Description Security For Basic Applications. Laminated Steel Case With 4-Pin Tumbler Mechanism. Dual-Locking System Independently Locks Each Shackle Leg For Added Strength. Plastic Bumper Protects Against Marring And Scratching. Hardened Steel Shackle. Two Keys Included. 1803 Has 1-1/2" Wide Case, 1/4" Diameter Shackle, And 3/4" Horizontal Shackle Clearance. 1805 Has 2" Wide Case, 5/16" Diameter Shackle, And 1" Horizontal Shackle Clearance. 1807 Has 1-1/8" Wide Case, 3/16" Diameter Shackle, And 9/16" Horizontal Shackle Clearance.