#23 Single End Explorer, Hollow Handle, Single Instrument. The HSB - Explorer SE #23 is an essential diagnostic tool for dental professionals, crafted with precision to enhance your exploratory capabilities. Made with an AISI 410 handle for durability and AISI 440 tips, this double-ended explorer features a shepherd's hook design, making it ideal for caries detection, calculus assessment, and the exploration of pocket characteristics, furcations, and restorations