Black Diamond Big Air Pilot Package Belay Device Dark Gray/Black The Black Diamond Big Air Pilot Package has all the same features as the ATC-Pilot plus a GridLock Carabiner. The ATC-Pilot is an enhanced breaking device. the ATC-Pilot introduces a system that provides an added level of security to your belay, while allowing for smooth rope pay out. Features: Accommodates ropes from 8.7-11 Provides an added level of security to single pitch belays Smooth rope payout, gradual lowering Steel construction Ergonomic, nonslip surface Single rope use Includes a GridLock Carainer Specs: Fits Rope Sizes: 8.7mm - 11mm