Nixon Sentry Stainless Steel The Sentry is an elegant timepiece with an adventurous side. Think black tie meets block party. The face pops with depth and detail, but the solid stainless steel case, hardened mineral crystal, and waterproof rating of 100m, you don't have to worry about it not being able to hang in the real world. Watch Size: 42mm Watch Case Material: Stainless Steel Watch Case Thickness: 12mm Watch Crystal Material: Hardened Mineral Watch Movement Type: Quartz Water Rating: 100 Meter / 10 ATM Lug Measurement: 23mm Band Material: Stainless Steel Band Connection: Spring Bar Band Type: Free Swing