6-32 x 4" Zinc Plated Toggle Bolt Anchors, 3/8" Drill Size / THREAD CLASS: 2A WING SPREAD WIDTH: 0.750 INCHES MINIMUM LENGTH: 4.000 INCHES NOMINAL NOMINAL THREAD DIAMETER: 0.138 INCHES THREAD QUANTITY PER INCH: 32 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM B633,FE/ZN 5,TY3 ASSN STD ALL TREATMENT RESPONSES OVERALL STYLE DESIGNATOR: B60 SPRING-WING, SHEET METAL, MACHINE SCREW THREAD SERIES DESIGNATOR: UNC