LaVaque Head & Shank Tweezers Feature Visual Alignment The patented LaVaque Head and Shank tweezers feature a curved grooved tip to securely hold the shank while a transparent glass base holds the setting, allowing you to see that it is perfectly aligned. The high-temperature glass withstands direct flame and soldering temperatures required for gold and silver. The replaceable glass lasts for dozens of jobs. Not recommended for platinum and other metals that require higher soldering temperatures.