These test tubes and caps are designed for demanding liquid handling and general laboratory applications. Test tubes feature uniform size, shape and wall thickness to help prevent cracking of the side walls and pinhole leaks. The special lip design provides for a precise fit when used with the appropriate cap closure to seal either inside the test tube or over the tube rim. Supplied with 12/13mm polyethylene snap cap. Multifitting flange and snap caps, also 12/13mm, are available separately. 12 x 75mm size; 5mL capacity.