Nozzle size: 34 x 2.0 mm and 50 x 2.0 mm glue gun nozzle and 50 x 3.0 mm glue gun nozzle and 70 x 2.0 mm glue gun nozzle. MULTIPLE SPECIFICATIONS: This nozzle can help stick in tight spaces, 4 different nozzle diameters to meet different working needs. Pure copper material: made of high quality brass, after hundreds of durability tests , still works like new, copper nozzles last longer than aluminum nozzles. No drips: All copper nozzles have built-in sealed steel balls, regardless of the preheating process , in use or after use, there will be no nozzle glue leakage. Wide range of uses: jewelry tools, glue gun accessories, can be used for very practical materials in daily life such as art flowers, toys, wood, plastic, glass, metal, stone, ceramics, bricks, paper, fabrics, etc. High Compatibility: This glue gun nozzle is suitable for most glue guns. You can measure your old nozzle Good quality product