A kit for testing the flexure characteristics (e.g. buckling strength) of stiff medical tubes (catheters etc.), guidewires and hypodermic needles with luer lock. Equipment includes a flexure table and two holding-down clamps for hypodermic needles, luer lock, guidewire or stiff medical tube. Differing specimen diameters are catered for by differently-shaped holding-down clamps (straight and prism-shaped) which are easily exchanged. The kit is designed for a maximum compression force of 50 N.