Comparison : Item # 01-52-30, 52 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-52-40, 52 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-52-50, 52 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-52-60, 52 Series: .125 Board Hole x .125 Chassis Hole
Item # 01-52-70, 52 Series: .125 Board Hole x .125 Chassis Hole