TOPEC 5-Piece Spiral Type Deep Extractor Set-T8007MULTI APPLICATION The tapered spiral design grips into the bolt from multiple contact points, providing maximum leverage to remove the stubborn fastener, Complex craftsmanship to make up for the shortcomings of other short extractors. 5 PIECE SET 5 Piece spiral type deep extractor set from 3 8"(9. 5mm), 7 16"(11mm), 1 2"(12. 7mm), 9 16"(14mm), 5 8"(16mm)in heavy duty carrying case. EASY OUT TOOL Specialized spiral design for a secure universal grip,