Printing resolution gauge. Different holes (metric) ranging from 1.0 up to 3.3 mm. Large 20 mm tube fitting test. 4.2 mm hole with locking ridge for 3,5mm gold plated bulletconnector. 1,2 and 3 mm thicknes can allso be measured. hole for a m3 nut is allso provided. This object is only usfull for testing the Shapeways printing resolution in the selected material. Happy printing. Unfortunately this model will be rejected for printing because of thinn walls. Strange because i had it printed before. Sorry for that.