TONI SYSTEM COMPONENT 4 holes thumb rest, left side, right hand shooter4 holes thumb rest, left side, right hand shooter The finger rest surface of the 4 hole model has an inclination from the barrel line of 25 the position of the finger rest is shifted upward by about 5 mm. The supporting surface is also different and forms a 44x13. 5mm rectangle. The hole spacing is 10mm. Weight 17,8g 0,62oz Material: Aluminum Compatibility: Beretta APX Tactical Glock 17 34 gen 3 Glock 17 34 gen 4 Glock 17 34 gen 5 Glock 19 gen 3 Glock