This precise set of 20 feeler gauges in the luthier's workshop can perform a wide variety of functions to measuring with string action to measuring the correct nut slot depths, fret slot width, string to fret clearances, and other hardware installation work, these ground steel feeler gauges are marked in both metric and imperial measurements for easy use.100 mm long, both metric and inch measurements are marked for easy use, include 20 thicknesses: 0.04mm(.0015"), 0.05mm(.002"), 0.06mm(.0025"), 0.10mm(.004"), 0.15mm(.006"), 0.18mm(.007"), 0.20mm(.008"), 0.25mm(.010"), 0.30(.012"), 0.35mm(.014"), 0.40mm(.016"), 0.45mm(.018"), 0.50mm(.020"), 0.55mm(.022"), 0.60mm(.024"), 0.63mm(.025"), 0.65mm(.026"), 0.70mm(.028"), 0.75mm(.030"), 0.80mm(.032") Shipping & Return ShippingAll orders are processed within 1-2 business days, You will receive a notification when your order has shipped.Successfully placed orders will receive an e-mail confirmation with the order details. If you do not receive an e-mail, please check your spam filter or contact us.For more shipping details please check our Shipping Policy. Country Ship From Delivery Time Price United States California 3-5 days (USPS First Class) Free United States California 2-4 days (USPS Priority)* Free Other Countries China 10-20 days (Standard) Free* Other Countries China 7-10 days (Expedited) Calculated *Shipping type automatically upgrade to USPS Priority when order weighs more than 1 pound. (United States)*For Canada shipping addresses, Shipping charges from 1kg. Below is the Standard shipping delivery time for some countries, for more information please check our Shipping Policy page. Country Delivery Time U.K 9-14 days Australia 12-20 days Canada 10-18 days ReturnWe want our customers to be happy. If for any reason you are not satisfied with your purchase from us and wish to return it for a refund, we accept returns up to 30 days after delivery. To start a return or you have any return question, please contact us.Damages and issuesPlease contact us if the item is defective, damaged or if you receive the wrong item, we will arrange a refund or exchange.RefundsWe will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.