Lightweight, durable nylon sleeves. For rotary and percussion drills and drill drivers. Set to hammer stop when using with hammers drills. Keyless operation. Capacity 1.0mm to 10mm. Lightweight, durable nylon sleeves. For rotary and percussion drills and drill drivers. Set to hammer stop when using with hammers drills. Keyless operation. Capacity 1.0mm to 10mm.