An excellent and secure way to mount your GPS.  Insert the mount base into the hole of the stem and tighten the machine screw with a wrench. This fits fork stems from 1/2'' to 1 1/4'' diameter (13mm to 32mm).
Features a spring loaded cradle that opens from 2 7/8'' - 3 1/2".  The cradle includes 3 sets of clamp arms (1/2", 7/8", 1 3/16").  Very tight hold on your GPS.

These fit many GPS models including:

Cobra: NAV ONE 2100 3000 4000 5000

Harman Kardon: GPS 300 310 500 510 810

HP: iPAQ rx5915 310 312 314 316 318 Travel Companion

Magellan: RoadMate  1200 1212 1230 1400 1412 1430 2035 2036 2036-MU 2045 2210 2210T 2220-LM 2230T-LM 3045 3045-MU 3045-LM 3055 3065 5220-LM 5230T-LM 5235T-LM

Magellan:  Maestro 3200 3210 3220 3225 3250 4200 4210 4220 4250

Maylong:  GPS for Dummies FD-220 FD-230 FD-250

Mio:  269 C310 C310x C320 H610 P710 C220 C230 C520 MOOV 200 210 300 310 500 Knight Rider

Motorola: T20 T30

Navigon: 1200 1210 1300 1310 1400 1410 2000S 2090S 2100 2100 MAX 2120 2120 MAX 2400 2410 2510 40 70 Premium Plus 3300 3310 4310 4350 Max 5100 6300 6310 3650 7100 7200T  
7310 8100T 8410 8450  

Navman: iCN 320 510 520 540 550 570 F10 F15 F20 F25 F30 F35 F40 F45 F50 S10 S20 N20 N40i N60i

Nextar: P3

Pharos: 135 140 250

TomTom:  GO 2505, GO 2405