The CAL-Van Tools Triple Square XZN Impact Bit Lot includes four pieces with sizes of 12mm, 8mm, and 10mm. These impact bits are designed for use with a 3/8″ drive size and feature a 12 point drive type. Made by CAL-Van Tools, known for quality automotive hand tools, these metric socket type bits are essential for automotive maintenance and repair. With no warranty provided, these durable and reliable tools are a valuable addition to any mechanic’s toolbox.