Made of anti-corrosion stainless steel. HOLE: 0.4/10 mm (hexagon). TOP HOLE approx 1.2 inch / 30.5mm (Due handmade work internal diameter can vary within 1.2-1.225 inch /30.5-31.1mm). We strongly recomend use with this model our Poles by CooB or other poles with Diameter 1.2 inch. Also you can use additionally electrical tape as sealing layer on your poles.
Can take sure about quality of the Goods, reviewing detail photos. This item is in the category "Business & Industrial\Test, Measurement & Inspection\Test Meters & Detectors\Metal Detector Accessories". The seller is "bycoob" and is located in this country: US.This item can be shipped to United States, all countries in Europe.