These punch needles are made of beech wood, with a a natural wax finish, and have a handle length of 4.9" . The Ergonomic needle has a circumference of 4.1"; the Smooth needle has a circumference of 1.95". The interchangable needles included are:
3mm tip - Use with Fingering and Lace yarns
4mm tip - use with Light Worsted, DK and Sport yarns
5.5mm tip - use with Chunky and Worsted yarns
The tips on these punch needles can be inserted so they are between 1" (2.5cm) to 1.5" (3.8cm), which produces a 0.5" (1.2cm) to 0.75" (1.9cm) long loop.