1、Made of aluminum，lightweight and durable, these blocks won\u0027t dull the cutting edges of your blades and bits. 2、5pcs Gauge Blocks set comes in five different sizes: 1/8\", 3/16\", 1/4\", 3/8\" and 1/2\", with the same length 2.55in. 3、There are clear size markings on the surface for easy use. 4、No measuring involved, simply use them as gauges to check distances or height, and you can combine two or more blocks if you need other sizes, flexible to use. 5、Widely used to set up bits, blades, fences, and other tools for precise distance and height. Features: 3pcs set includes 1 Ring Sizer Mandrel, 1 Ring Sizer Gauge and 1 Measuring Tape, useful tools for quickly figure out the sizes of rings and fingers. Ring Sizer Mandrel is UK standard and made of aluminium, High quality and easy to read size chart on mandrel for full and half sizes. Ring Sizer Gauge comprises of 26pcs, available in UK standard and US standard, A-Z in UK Standard and 0-13 in US Standard. Also comes with a ring measuring tape in US or UK standard for you to choose. Specifications: Material: Aluminium Set: (Optional) Set 1 - UK Standard Ring Sizer Mandrel & 0-13 US Standard Ring Sizer Gauge & US Standard Measuring Tape Set 2 - UK Standard Ring Sizer Mandrel & A-Z UK Standard Ring Sizer Gauge & UK Standard Measuring Tape Ring Sizer Gauge Size: 10*5*3cm / 3.93 * 1.96 * 1.18in Ring Sizer Mandrel Size: 26*3*3cm /  10.23 * 1.18 * 1.18in Measuring Tape Size: 11.5*1cm /  4.52 * 0.39in Package Weight: 240g / 8.46oz Package Size: 30*10*3cm / 11.81 * 3.93 * 1.18in Packing List: 1 * UK Standard Ring Sizer Mandrel 1 * 0-13 US Standard Ring Sizer Gauge 1 * US Standard Measuring Tape 1 * UK Standard Ring Sizer Mandrel 1 * 0-13 US Standard Ring Sizer Gauge 1 * US Standard Measuring Tape