Features of Dycem Non-Slip Cone-Shaped Jar Opener: Jar opener is dome shaped to fit comfortably in the palm of the hand. Effective on screw-top jars including child resistant and tamper-proof lids. 4-1/2" diameter. With one of the largest catalogs of medical, surgical and diagnostic supplies available online, Medex Supply can accommodate your facility's needs for Exercise Equipment. Physical Therapy can be found in our extensive online collection of products from globally recognized and trusted brands, including Fabrication Enterprises. An excellent option to consider is the Dycem Non-Slip Cone-Shaped Jar Opener.