04-164-15 Micro Needle Holder Size: 15 cm 04-164-18 B Size: 18 cm 04-164-21 C Size: 21 cm 04-164-23 D Size: 23 cm 04-164-15 E Size: 15 cm 04-164-18 F Size: 18 cm 04-164-21 G Size: 21 cm