Wheeler Wheeler, Delta Series AR-15 Delta Ring Tool, Black 209943 The Wheeler Engineering(R) AR-15 Delta Ring Tool makes removing mil-spec AR-15 and M16 handguards easy by compressing the Delta Ring with one hand. Its 100% vinyl coating protects the guns finish from damage but is very durable" and a custom formed wire fits securely around Delta Ring. The Delta Ring Tool has a welded steel bracket for durability even with stuck or broken Delta Rings.