Qwork Beam Clamp, 20 Pcs 3/8" Zinc Plated Iron Safety Beam, 13/16" Jaw Opening Product Details Material: Premium malleable cast iron and Zinc coating, anti-corrosion and durable. Rod(thread) Size: 3/8", Max Jaw Opening: 13/16". Max. Load (Lb.): Top of Beam 500 and Bottom 250. Usage: Suitable for Structural Attachment to Top Or Bottom Of Metal Beams, Or Angle Iron, Purlins. Package: 20 Pack, Enjoy a smooth worry-free return service within a month! Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.