Lock specs:

• 14mm Locking Pin
• Double-Locking System
• High Nickel Stainless Steel
• Weight: 635g (1.45 lbs.)
• 7mm Gap Height, 46mm Depth
• High-Security Key and Barrel
• Ideal Commuter Security

Alarm specs:

• Auto-Alarming System
• 110dB Warning Siren
• Dual Shock & Movement Sensors
• Removable Alarm Module
• Adjustable Sensitivity
• "Smart" LED Arming Sensor
• 6 x LR44 1.5v Alkaline

Xena XN18 Ultra High Security Alarm Disc Lock ... £99.99