Hiplok v1.50 Wearable Bicycle Lock (Black/Reflective/Green) Waist Sizing: Minimum 26? (66cm) / Maximum 44? (112 cm) Locking Circumference: Maximum 90cm Weight: 1.8kg / 4lbs Adjust the Hiplok around waist to a secure, comfortable tension as you would a normal belt Put key into padlock buckle, take other end of belt and loop the last chain link into padlock loop