Klein Tools Full Brim Hard Hat Earmuffs are designed to work with all Klein Tools Full Brim Hard Hats, and are intended to provide limited protection from harmful noise. Tested in accordance with ANSI S3.19-1974 standards, the NRR (noise reduction rating) for these earmuffs is 26dB. Designed for all day comfort and effective acoustic seal.Features Earmuffs designed for use with Klein Tools Full Brim Hard Hats Soft foam ear cushions for effective acoustic seal and all-day wear Designed with pivot positions on earmuff connector for in-use, stand-by, and storage positions Easy to adjust wire arms for customized fit Adjustable Wire Arms for Custom Fit Durable ABS plastic cup for rugged environments Noise Reduction Rating (NRR): 26dB Spacious interior for comfortable ear fit WarningsRead all instructions and warnings before using this product. Failure to follow these instructions and warnings may result in serious personal injury. Noise Reduction Rating: Safety Helmet - 26 dB; Cap-Style Hard Hat - 27 dB Height: 2.6 in (6.6 cm) Depth: 7.1 in (18 cm) Width: 3.9 in (9.9 cm) Weight: 0.41 lbs Application: Hard Hat Attached Earmuffs Type: Full Brim Material: ABS Plastic, Foam Insulated: No Connector Type: Pivot Positions for In-Use, Stand-By, and Storage Adjustability: Adjustable Wire Arms Interior Fit: Spacious Interior for Ear Comfort Standard: ANSI S3.19-1974 Color: Gray/Orange DownloadsSpec SheetVideo DownloadInstructions60502-instructions- WEB.pdf