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Amazon [amazon.com] has 2-pack Nite Ize S-Biner MicroLock Locking Key Holder (Stainless Steel) for $ 3.13. Shipping is free w/ Prime or on $ 35+ orders

Features:

• Easy/Secure Way to Hold Your Keys
• Easy Twist to Lock Mechanism
• High Quality Stainless Steel
• Locking Twist Lever
• Fits Multiple Keys Per Microlock (Up to 3 Standard Keys)