This document contains data on the diameter grip (DG) measurements of students from two grade levels. It lists the group number, student names, and DG measurements in centimeters for 30 students in Wave I of the 2014-2015 school year and 38 students in Wave II of the same school year. The DG measurements range from around 3 to 6 centimeters. The data is presented in a table format with the group number, student names, and their corresponding DG measurements.